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The Value of Animal Fat in Rations for Milk Production¹

Department of Dairy Science, University of Illinois, Urbana

ABSTRACT

Conclusions: Stabilized animal fat after 8 weeks in storage was palatable to dairy cows when included in grain mixtures to give levels of 8% and 12% total fat. Stabilized animal fat of the quality and at the levels used in this experiment can safely be fed to dairy cows during either the barn-feeding or the pasture season. No significant increase in yield of milk or percentage content of milk fat was obtained with different levels of fat feeding. No significant change in the composition of butterfat as measured by iodine, saponification, and Reichert-Meissl numbers was found to be associated with the feeding of animal fat. The carotene and vitamin A values of milk and blood plasma were not significantly altered when the cows were consuming added animal fat in their grain mixtures.

¹ The data reported here were taken from a thesis presented by O. H. Horton to the Graduate College, University of Illinois, in partial fulfillment of the requirements for the Ph.D. degree, 1955.

² Present address: Department of Animal Industry, University of Arkansas, Fayetteville.